validity interview teacher interrater check OF item 144 138 index calculating difficulty APPENDIX input student analysi aspect essay anate content multiple self appendix 125 LIST sheet construction 147 card four choice lattice level 149 language 118 different 145 examination test scale question point format distribution reviewer agreement reliability cognitive page 150 letter 114 effectivenes data 131 162 list assessment 143 169 148 criteria selection material distractor 146